Port 25

[Gary Yu]

Hi experts,

I'm configuring one of my HPUX box(host1) to send out mails(within LAN). When I tried to send mails to user on another host (test01@host2.mydomain.com), it's OK when I verify with "sendmail -bv":
test01@host2.... deliverable: mailer smtp, host, user test01@host2.

but when I really sent it, I got this:
test01@host2... Deferred: Connection timed out with host2.mydomain.com

in host2, sendmail is runing, using ps -ef|grep sendmail, I got "sendmail: accepting connections on port 25"

when I tried port 25 on host2 from host1, using "telnet host2 25" I also got timeout, so why can't host1 talk to host2 through port 25?

[harry d brown jr]

Is sendmail running on host2? Also, do you have a route to host2 (can you ping it or just simply telnet to it)?

[someone_4]

Hi
First make sure that
both hosts are in your etc/hosts file
and could you please post what you get when you do
sendmail -v test01@host2
try it both my hostname and ip
aslso check
/etc/services for this line
smtp 25/tcp # Simple Mail Transfer Protocol

make sure it is not commented out

Richard

[Gary Yu]

Thanks Harry and Richard for the prompt respones.

host1 is also a dns server, when I issue nslookup host2 on host1 it's ok.(they are in the same sub-net)
when I issue sendmail -v test01@host2, I got this:
test01@host2... Connecting to host2.mydomain.com. via smtp...
test01@host2... Deferred: Connection timed out with host2.mydomain.com.

The other thing is, I can telnet to port 25 of the host itself(in host1 "telnet host1 25", or in host2 "telnet host2 25" both suceeded), but if "telnet host2 25" on host1, I got timeout.

[Sridhar Bhaskarla · Accepted solution]

Gary,

I am hoping that you are able to telnet
from each other.

Make sure your haven't commented out 25/tcp in your /etc/services file.

Make sure you are allowing SMTP in /var/adm/inetd.sec

Make sure you are not using any firewalls in between.

If the sendmail daemon is not active, you will get a connection refused message when telnet at the port 25.

It's most likely a firewall issue or /var/adm/inetd.sec issue (this also gives connection refused)

-Sri

[someone_4]

Hey gary
I see you got it going ..
what specifly was the problem.


Richard

[Ovidiu D. Raita]

looks like host2 cannot resolve host1's address. Try to ping host1 from host2. Try the same thing with the domain name host1.mydonain.com or try nslookup.

Ovidiu